package com.sxjh.socket;

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSON;
import com.sxjh.entity.param.MsgVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


/**
 * APP端极星AI监控.
 *
 * @author zt23058
 */
@Slf4j
@ServerEndpoint("/app/star/{userId}")
@Component
public class AppStarSocketServer {
    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static volatile int onlineCount = 0;
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static ConcurrentHashMap<String, AppStarSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;
    /**
     * 接收userId
     */
    private String userId = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
        } else {
            webSocketMap.put(userId, this);
            addOnlineCount();
        }
        //log.info("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("用户:" + userId + ",网络异常!!!!!!");
        }
    }


    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message) {
        //消息保存到数据库、redis
        if (StrUtil.isNotBlank(message)) {
            try {
                //解析发送的报文
                MsgVo msgVo = JSON.parseObject(message, MsgVo.class);
                msgVo.setFromUserId(this.userId);
                String toUserId = msgVo.getToUserId();
                //传送给对应toUserId用户的websocket
                if (StrUtil.isNotBlank(toUserId) && webSocketMap.containsKey(toUserId)) {
                    webSocketMap.get(toUserId).sendMessage(msgVo.getMsg());
                } else {
                    log.error("请求的userId:" + toUserId + "不在该服务器上");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     */
    public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
        //log.info("发送消息到:" + userId + "，报文:" + message);
        if (StrUtil.isBlank(userId)) {
            //推送所有在线
            for (Map.Entry<String, AppStarSocketServer> entry : webSocketMap.entrySet()) {
                entry.getValue().sendMessage(message);
            }
        } else {
            if (webSocketMap.containsKey(userId)) {
                webSocketMap.get(userId).sendMessage(message);
            } else {
                log.error("用户" + userId + ",不在线！");
            }
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        //log.info("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        //log.error("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        AppStarSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        AppStarSocketServer.onlineCount--;
    }
}
